Improvement in saw-swages



22727-2 Aym'.

N.FETEns, PHOTO-LTHOGRAP WASHINGTON o c Ingen W? N. Firms, mTuTNoGRAPMER, WASHINGTON D C NrTnD vSTATES PATENT OFFICE.

NELSON JOHNSON, OF JASPER, NEW YORK.

IMPROVEMENT IN 4sAw-swnclas.y

Specification forming part of Letters Patent No. 96,596, dated November 9, l1869.

To all whom t may concern:

Be it'known that I, NELSON JOHNSON, o Jasper, in the county of 'Steuben and State of New York, have invented certain new and useful Improvements in Saw-Swages; and I do hereby declare that the following is a full, clear, and exact description thereof, reference being had to the accompanying drawings, which are made a part of this specication.

My present invention relates, first, to the provision in a saw-swage of an adjustable rest for the purpose of supporting and steadyingit while it is being used, and, second, to a novel construction of the swage pin or die, so that the force of the blow may be applied directly to the pin instead of to the stock, as heretofore. In the drawings, Figure l is a perspective view of a saw-swage embodying my improvement, illustrating the manner of' applying it to the saw. Fig. 2 is an inverted plan view of the same 5 and Figs. 3 and 4, sectional detached views, illustrating diiferent'forms ot'dies. Fig. 5 is a perspective view of an Em merson swage provided with a modified form ot' my adjustable rest.

In Figs. 1 to 4, A represents the stock, B the swage pin or die, and G the adjustable rest. The stock A may be of wrought or cast iron or other suitable material, and ofany suitable form. The swage-pin B is of steel, preferably rectangular in cross-section, and is held in a corresponding longitudinal aperture or way in the stock A, as shown, it being either perfectly straight, as represented in Figs. l, 2, and 4, to adapt it to slide in the stock, or slightly tapered, as represented in Fig. 3, so as to prevent its forward displacement in the stock. In the former case a spring, D, is provided to retract the swage-pin after it has been driven forward by a blow, said spring being attached to the 'stock by means of a rivet, d, and engaging with a notch, b, in the pin.

The face ofthe swage-pin I construct ofseveral different forms, to adapt it for different kinds of work. In Figs. l, 2, and 4 a form of face or die is represented, by means of which the width of' the point may be gaged as desired. The point ofthe swa ge-pin is provided with notches or grooves b b, of any desired angle, and of such width as may be required for the form of tooth to be swaged. As shown in Fig. 4, these notches b and b" may have respectively a flat and curved bottom; and I do also make them ried to suit the form of tooth on which used, Aand the diierent sides of the point may b readily thus varied.

The rest C consists of a flat bar of wroughtiron or steel, bent at right angles at c to form a suitable surface to rest on the saw, and secured to the stock by means of a set-screw, E, a suitable recess being, when desired, formed in the side of the stock for its reception. A slot, c', is provided in the rest C for the reception ofthe screw E, thus allowing the requisite adjustment of the swa-ge to suit different sizes of saws; and when the rest is arranged as shown it may readily be turned over the end, so as to use the other side of the point without the trouble of changing the pin.

In Fig. 5 the rest (Fs of modied form is represented as applied to an Emmerson swage. It consists in this case of a plate of any'suitable form, having a screw-threaded shank, 0*, which enters a similarly-threaded aperture in the stock of the swage, and receives above it a clamp-nut, 0*. The bearing-point cit of this rest is suitably beveled to oppose as little frictional surface as possible to the driving of the swage. A notch, (ft2, in this surface, covered by a pivoted slide, cita, adapts the swage to be firmly held in a central position when desired.

My rest is further applicable to all of the dierent forms of swa ges, and obviously may be modified as required for the diiferent forms without departing'from the invention. The provision of my rest adapts the swage to be applied to the teeth at a uniform angle, and be rmly held while being driven, s'o that by means of it straight and uniform teeth may be formed by a person incapable of using the swage without it, as, although it is necessary for the swage to be thus held, it has heretofore depended entirely on the steadiness of the operators hand--a feature very rare to the extent required for this purpose, as the least movement under the blow of the hammer bends the point of the tooth, and if it be hard will lowing is what I claim as new and desire to secure by Letters Patent:

1. In combination with the stock A and sliding swage-pin B, theV adjustable rest C, adapted to bear upon the edge of the saw, substantially as described, and rendering unnecessary a foundation upon the hub or mandrel.

2. The swage-pin B, extendinglongitudinally through the stock, for the purpose of adapting it to receive the blow direct, substantially as described.

3. A swagepin, B, having a point, b3, coinposed of a plurality of bevel surfaces of the same or dierent angles, substantially as described, for the purposes set forth. l

4L. A swage pin extending longitudinally through the stock, so as to be acted on direct by the blow of the hammer when tapered, so as to prevent its movement in the stock, substantially as represented and described.

To the above specification of my said improvement I have signed my hand this 9th day of July, A. D. 1868.

NELSON JOHNSON.

Witnesses:

S. GOUNTRYMAN, A. B. SIMPSON. 

